[CRIU] [PATCH 3/6] mnt: add a sub-id to print_ns_root

[Andrei Vagin]

From: Andrei Vagin <avagin at virtuozzo.com>

It will be used to handle overmounts

Signed-off-by: Andrei Vagin <avagin at virtuozzo.com>
---
 criu/mount.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/criu/mount.c b/criu/mount.c
index c2506cb..6717b96 100644
--- a/criu/mount.c
+++ b/criu/mount.c
@@ -3013,9 +3013,9 @@ void mnt_entry_free(struct mount_info *mi)
  * Helper for getting a path to where the namespace's root
  * is re-constructed.
  */
-static inline int print_ns_root(struct ns_id *ns, char *buf, int bs)
+static inline int print_ns_root(struct ns_id *ns, int remap_id, char *buf, int bs)
 {
-	return snprintf(buf, bs, "%s/%d", mnt_roots, ns->id);
+	return snprintf(buf, bs, "%s/%d-%010d", mnt_roots, ns->id, remap_id);
 }
 
 static int create_mnt_roots(void)
@@ -3160,7 +3160,7 @@ static int collect_mnt_from_image(struct mount_info **pms, struct ns_id *nsid)
 		return -1;
 
 	if (nsid->type == NS_OTHER)
-		root_len = print_ns_root(nsid, root, sizeof(root));
+		root_len = print_ns_root(nsid, 0, root, sizeof(root));
 
 	pr_debug("Reading mountpoint images (id %d pid %d)\n",
 		 nsid->id, (int)nsid->ns_pid);
@@ -3281,7 +3281,7 @@ int rst_get_mnt_root(int mnt_id, char *path, int plen)
 		return -1;
 
 	if (m->nsid->type == NS_OTHER)
-		return print_ns_root(m->nsid, path, plen);
+		return print_ns_root(m->nsid, 0, path, plen);
 
 rroot:
 	path[0] = '/';
@@ -3401,7 +3401,7 @@ static int populate_roots_yard(void)
 		if (nsid->nd != &mnt_ns_desc)
 			continue;
 
-		print_ns_root(nsid, path, sizeof(path));
+		print_ns_root(nsid, 0, path, sizeof(path));
 		if (mkdir(path, 0600)) {
 			pr_perror("Unable to create %s", path);
 			return -1;
@@ -3693,7 +3693,7 @@ int prepare_mnt_ns(void)
 
 		/* Set its root */
 		path[0] = '/';
-		print_ns_root(nsid, path + 1, sizeof(path) - 1);
+		print_ns_root(nsid, 0, path + 1, sizeof(path) - 1);
 		if (cr_pivot_root(path))
 			goto err;
 
-- 
2.7.4